Single-crystal 2D covalent organic frameworks for high-capacity methane storage.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 41688493.
- Also identified by DOI 10.1038/s41467-026-69614-7 and PMC identifier 13013593.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
2D covalent organic frameworks (COFs) usually possess a polycrystalline nature as well as lower porosity and surface area than 3D counterparts, restraining their exploration over gas storage applications. Herein, a substituent strategy has been proposed and employed to generate three robust single-crystal 2D COFs isomers with atom-resolution structures determined by 3D electron diffraction. Among three isomers, a precise engineering of their interlayer distance affords the highest Brunauer-Emmett-Teller surface area of ~2100 m<sup>2</sup> g<sup>-1</sup> and the largest pore volume of 1.40 cm<sup>3</sup> g<sup>-1</sup> for the desolvated GZU-1. This COF shows the highest total volumetric methane uptake of 240 cm<sup>3</sup> (STP) cm<sup>-3</sup> at 273 K and 100 bar among 2D COFs, even comparable with those for excellent 3D MOFs. This work not only delivers unique insight into the design of 2D single-crystal COFs by interlayer stacking regulation, but also promotes the application of highly porous 2D COFs in gas storage.